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Old 28th November 2012, 09:31 AM   #1
cb5 is offline cb5  United Kingdom
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Default Looking to build my first tube amplifier

Hi Everyone,

Its probably been asked many times before, but please hear me out.

Iv built a gainclone and a few chip amps, i can use a soldering iron and a multimeter etc and i do have some electronic knowledge.

Im looking to build my first tube amplifier to power a pair of 8R bookshelf speakers. Power output doesnt need to be massive, maybe 5W per channel or something similar?

I dont want to spend hundreds, i want to experiment building my first tube amp so the more simple the better.

Does anyone have any reccomendations?

Thanks
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Old 28th November 2012, 10:15 AM   #2
roline is offline roline  United States
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I'm designing a PCB layout for a PP 6LU8 tube set where the goal is 20-25watts/channel. The tubes are still inexpensive, I found 6 for $10.
It could use the transformer set from Edcore used for the big red board.
I have a set of Bogen 6.6k iron to try and several power transformers.
Have you ever done toner transfer etch resist for PCB fabrication?
What level of a build are you looking for? point to point, PCB, SET, PP any particular output tube family?
I'm planning on etching a PCB and stuffing it over Christmas vacation. I have a few components yet to scrounge for it. I have it designed for fixed or cathode bias, pentode, triode or UL on the outputs.... too many choices.....
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SO many tubes, SO little time!!!
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Old 28th November 2012, 10:38 AM   #3
cb5 is offline cb5  United Kingdom
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Quote:
Originally Posted by roline View Post
I'm designing a PCB layout for a PP 6LU8 tube set where the goal is 20-25watts/channel. The tubes are still inexpensive, I found 6 for $10.
It could use the transformer set from Edcore used for the big red board.
I have a set of Bogen 6.6k iron to try and several power transformers.
Have you ever done toner transfer etch resist for PCB fabrication?
What level of a build are you looking for? point to point, PCB, SET, PP any particular output tube family?
I'm planning on etching a PCB and stuffing it over Christmas vacation. I have a few components yet to scrounge for it. I have it designed for fixed or cathode bias, pentode, triode or UL on the outputs.... too many choices.....
Hi,

I have done toner transfers for PCB fabrication before. Im looking to build something P2P if its simple enough, but otherwise i suppose a PCB.

I am willing to build anything but im in the UK so the iron must be available here
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Old 28th November 2012, 10:57 AM   #4
chrish is offline chrish  Australia
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Tubelab simple se is a great project. 'Tubelab' is a regular to this forum and this design comes as a easy to use printed circuit board. I made one 6 years ago and it is still working great. Simple SE

Also see his section on the forum Tubelab - diyAudio
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Old 28th November 2012, 11:04 AM   #5
cb5 is offline cb5  United Kingdom
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Is there a basic p2p design that anyone can reccomend?
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Old 28th November 2012, 11:30 AM   #6
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Quote:
Originally Posted by cb5 View Post
Is there a basic p2p design that anyone can reccomend?
Maybe not as simple as Tubelab's SimpleSE, but I would recommend Gingertube's "Baby Huey" (search this forum). It can be wired easily P2P if you put the CCSs on small PCBs.
Also SY's red light district amp looks good as a beginner project.

A "Baby Huey" is still my main system and waits for something to beat it in size and sound quality (small size is a big part of the WAF).

Martin
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Old 28th November 2012, 11:51 AM   #7
cb5 is offline cb5  United Kingdom
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Thanks do you think i should start with something more simple for my first amp?

I would like to get to grips with p2p
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Old 28th November 2012, 01:51 PM   #8
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Bookshelf speakers usually have low sensitivity. 5W is not enough if you want to *really* enjoy dynamic, distortion-free music. I would say 25W is a minimum...
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Old 28th November 2012, 02:01 PM   #9
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Quote:
Originally Posted by roline View Post
I'm designing a PCB layout for a PP 6LU8 tube set where the goal is 20-25watts/channel. The tubes are still inexpensive, I found 6 for $10.
You should keep a few electrolytic caps handy, because the ones right next to the tubes on your PCB will die young...
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Old 28th November 2012, 02:07 PM   #10
cb5 is offline cb5  United Kingdom
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Quote:
Originally Posted by Vincent77 View Post
Bookshelf speakers usually have low sensitivity. 5W is not enough if you want to *really* enjoy dynamic, distortion-free music. I would say 25W is a minimum...
Thanks, il try and look for something a bit more powerful but they seem quite complicated to build
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